Now you've learned how to build basic rules and chains and how to add or remove them from the packet filtering tables.
现在，您已经学习了如何建立基本的规则和链以及如何从信息包过滤表中添加或删除它们。
These three chains are the main chains built-in by default inside basic packet-filtering tables.
这三个链是基本信息包过滤表中内置的缺省主链。
Chapter 5 and chapter 6 implements some security functions based on the basic data path implemented in the chapter 4, they are packet filtering and network address transition (NAT).
第五章和第六章分别在第四章所实现的基本数据通路的基础上实现了一些安全特性，它们是包过滤和网络地址转换(NAT)。
Chapter 5 and chapter 6 implements some security functions based on the basic data path implemented in the chapter 4, they are packet filtering and network address transition (NAT).
第五章和第六章分别在第四章所实现的基本数据通路的基础上实现了一些安全特性，它们是包过滤和网络地址转换(NAT)。
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